PC Build to Run Gemma 4 31B Locally (Q4_K_M)

作者： Jakub Rusinowski · 最后更新： 2026年3月31日

A complete parts list — GPU, motherboard, RAM and PSU — worked backward from Gemma 4 31B's VRAM requirement at Q4_K_M. Prices are 2026 street estimates and vary.

Requirements

VRAM required~20 GB at Q4_K_M
System RAM40 GB
Complete build (est.)$1,864
Buy This HardwareAMD Radeon RX 7900 XT 20GB — 20 GB VRAM · 315 W board powerDeploy in the Cloud NowRTX 4090 on RunPod — from $0.34/hr · rate checked 2026-07

or compare on Vast.ai from $0.35/hr (typical low · varies)

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GPU: AMD Radeon RX 7900 XT

AMD Radeon RX 7900 XT's 20 GB covers Gemma 4 31B at Q4_K_M (~20 GB needed), a tight fit — little headroom.

AMD Radeon RX 7900 XT 20GB
20 GB VRAM · 315 W board power
2026年价格波动较大——请以当前商品页价格为准。
在亚马逊查看价格

Motherboard: ASUS TUF Gaming B650-PLUS WIFI

B650 (AM5) — pairs with the AMD Ryzen 7 7700; DDR5, dual PCIe 4.0 x16 (x8/x8) for multi-GPU, 4 DIMM slots to 256 GB.

ASUS TUF Gaming B650-PLUS WIFI
2026年价格波动较大——请以当前商品页价格为准。
在亚马逊查看价格

RAM: Corsair Vengeance 64GB (2x32GB) DDR5-6000 C30 (AMD EXPO)

64 GB DDR5-6000 (2x32GB) meets Gemma 4 31B's 40 GB recommended system RAM.

64GB DDR5-5200 Kit (2x32GB)
2026年价格波动较大——请以当前商品页价格为准。
在亚马逊查看价格

PSU: Corsair RM650e (ATX 3.1)

650 W 80+ Gold covers AMD Radeon RX 7900 XT (315 W) + CPU 65 W with 30% headroom (~494 W required).

Corsair RM650e (ATX 3.1)
2026年价格波动较大——请以当前商品页价格为准。
在亚马逊查看价格

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FAQ

What GPU do I need to run Gemma 4 31B at Q4_K_M?

AMD Radeon RX 7900 XT's 20 GB covers Gemma 4 31B at Q4_K_M (~20 GB needed), a tight fit — little headroom.

How much VRAM does Gemma 4 31B need at Q4_K_M?

About 20 GB of VRAM plus 40 GB of system RAM.

What power supply does a AMD Radeon RX 7900 XT build need?

650 W 80+ Gold covers AMD Radeon RX 7900 XT (315 W) + CPU 65 W with 30% headroom (~494 W required).

How much does a Gemma 4 31B PC cost?

About $1,864 for a complete build (GPU, motherboard, RAM, PSU, CPU, case, SSD), at 2026 street-price estimates.

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← Budget-first build recommender | Gemma 4 model page | AMD Radeon RX 7900 XT review